Abstract: The invention is directed to an electrical charging base for a battery-powered appliance having an electrical charging contact and includes a frame defining a shaped cavity for receiving an appliance in only one orientation, a rectifying circuit disposed in the frame for converting source alternating current to charging direct current, the rectifying circuit including a charging output contact disposed for electrical connection to the charging contact of an appliance when disposed in the cavity and a source input contact for electrical connection to an electrical source. A bypass circuit is disposed in the frame for electrically connecting the source input contact to a source output contact. The invention further comprises a jumper for electrically connecting the source output contact of one charging base to the source input contact of a second charging base.

Abstract: Before a synchronous machine is connected with a line, the set value of a voltage setter is controlled so that the difference between the line voltage and the set value of the voltage setter is decreased to zero, and a field current is then controlled so that the difference between the set value and the output voltage of the synchronous machine is decreased to zero, thereby parallel-connecting the synchronous machine with the line.

Abstract: A latching arrangement is provided in a high speed battery charging circuit. The latching arrangement includes a momentary switch for momentarily changing a voltage level on a gate controlling capacitor for a gate controlled high current path and an inversion circuit between the capacitor and the gate, thus permitting a voltage provided by a thermostatically controlled switch to be applied to the capacitor for controlling the gate. The thermostatically controlled switch senses battery cell temperature and permits fast charging for temperatures below a threshold. The momentary switch is momentarily activated to initiate the fast charging operation. Upon sensing a temperature rise, the thermostatically controlled switch terminates fast charging and initiates trickle charging. When the battery cell cools and the thermostatically controlled switch again closes, the latching arrangement prevents resumption of a fast charge operation.

Abstract: A transformer employed in a power supply circuit of a ringing choke converter type comprises two feedback windings which share the current to be supplied to the base of a switching transistor for blocking oscillation. By virtue of the provision of the two feedback windings, a speedup capacitor for delivering a trigger current to the switching transistor is allowed to have less capacity, while the amount of heat generation of a resistor for regulating the trigger current can be restrained. These advantageous features of the present invention produces the effect that the bulk and weight of the capacitor and the resistor can be reduced, which leads to curtailing of the cost of the components as well as enhancing of the reliability of the circuit. The effect is more appreciable when a higher output is required.

Abstract: A front loading facility for continuously charging rechargeable batteries in headphones or other device, comprises an enclosure containing a slidable drawer in which rests the device to be charged. The device to be charged has contacts which bear against spring contacts when the drawer is closed, but a spring ejects the drawer upon energizing of a solenoid of actuated latch. A voltage and current regulated power supply continuously charges the batteries through a light emitting diode, which has a secondary function of preventing inadvertent battery discharge.

Abstract: A power source circuit has an electric energy generator, two condensers, a switching element and a voltage detecting circuit. The first condenser accumulates electric energy which is generated by the electric energy generator, such as a solar cell, and the second condenser supplies electric energy to a load. The switching element controls the electric energy transfer from the first condenser to the second condenser in response to the output of the voltage detecting circuit which detects the terminal voltage of the second condenser. The first condenser has a relatively high withstand voltage and relatively small capacity and volume so as to obtain a quick start-up operation of the circuit and a prolonged operation.

Abstract: The invention relates to an on board power supply, particularily for a ship propelled by a variable speed diesel engine (1), comprising a first alternator (2) coupled to a diesel engine, an electronic regulator (4) for the first alternator, a rectifier (5) for rectifying the output current of the first alternator, a direct current motor (6) powered from the output of the rectifier, and a second alternator (8) coupled to the direct current motor.It also comprises means (13) for selectively feeding the regulator of the first alternator from the output (12) of the first alternator or from the output (11) of the second alternator.

Abstract: An arrangement for recovering power loss of an internal combustion engine including a turbine, the driving power of which stems from a power loss of the internal combustion engine. The turbine is coupled to a generator, a winding of which feeds a d-c motor relieving the internal combustion engine. Power matching between the generator and the d-c motor is made possible without a separate control device because the generator or its excitation circuit is designed in such a manner that the voltage induced in the generator winding exhibits a steep dependence within a narrow operational speed range.

Abstract: An apparatus which is capable of providing an advance warning for indicating excessive discharge of a battery, during the supply of electric power from the battery to a load, prior to the battery being unuseable for powering the load. The apparatus comprises first power supplying means for initially supplying power from the battery to the load, supervisory control means for continuously monitoring the residual or current power capacity of the battery and interrupting or reducing the supply of power to the load when a predetermined quantity of power consumption is detected, and second power supplying means for supplying, subsequently, the residual power of the battery to the load when the first power supplying means is rendered inoperative.

Abstract: A rectifying system for a magnet-type AC generator comprises a rectifier circuit including a composite bridge of a plurality of diodes and a plurality of thyristors for regulating and rectifying the output voltage of the AC generator, a first phase control circuit for applying a firing signal to the thyristors, a neutral-point diode, a neutral-point thyristor, and a second phase control circuit for controlling the phase of the neutral-point thyristor. The neutral-point thyristor is phase-controlled, and the voltage applied to a battery with an electrode thereof connected to the diodes is thereby regulated.

Abstract: In a compound electromechanical assembly having a first singly fed stage mounted for common rotation with a second singly fed stage mounted for common rotation with a second singly fed stage impedance is inserted in inverted connection to form an electrical loop between the secondaries. The impedance includes a resistor and capacitor connected in parallel.

Abstract: A combined electrical filter and interrupted energy source for a space satellite or other DC powered apparatus. The disclosed filter battery preferably employs an array of nickel-cadmium cells each having circular configured electrodes parallelly disposed along an axis and interconnected by axially aligned inter-call conductors which attach to central areas of the electrodes. The resulting filter battery is electrically comprised of an array of selected value electrical elements disposed in a parallel-series configured network and related to elements of the battery cell structures. Filtering accomplished with the filter battery achieves high electrical energy per pound storage density, low electrical impedance, long charge/discharge cycle life, large current delivering ability and more constant voltage output in comparison with conventional electrolytic capacitor filter elements and other cell configurations.

Abstract: A circuit for supplying energy from a battery to the load of an energy-using device is provided wherein the circuit provides for notification to the operator of the device that the remaining energy of the battery is low. The notification is provided at a time when sufficient energy remains in the battery for the operator to perform certain essential tasks. The circuit includes a battery having a plurality of cells connected in series, a first portion of which have a higher deliverable energy capacity than a second portion of the plurality of cells. The circuit further provides for sensing a characteristic of the battery indication of the remaining deliverable energy capacity lower deliverable capacity cell portion and for switching the circuit from a first mode of operation wherein energy is delivered to the load from all of the cells in the plurality to a second mode of operation wherein the energy is delivered to the load from only the higher capacity portion of cells.

Abstract: A battery charging circuit which automatically cuts off whenever a battery becomes fully charged. The circuit includes a source of pulsating d.c. charging current and an SCR connected in series with a battery to be recharged. A resistor and capacitor are connected in series in the order named between the anode electrode and the cathode electrode of the SCR which has its gate electrode connected, via a diode, to the circuit point between the cathode and the resistor. A further resistor is connected across the capacitor. When the battery becomes substantially charged, the voltage which appears across the first-mentioned resistor is insufficient to fire the SCR and charging current is no longer delivered to the battery.

Abstract: An electronic voltage regulator for an ac electric generator precisely controls the generator output voltage and enhances motor starting ability. A filtered dc representation of the output voltage of the generator is produced by circuitry sensing the output voltage of the generator and rectifying to dc and filtering the voltage sense to obtain a relatively smooth dc voltage which is directly proportional to the output voltage of the generator and has on it a small amount of ripple voltage. A dc voltage which is proportional to the frequency of the generator is also produced by circuitry means which senses the frequency of the generator and produces a dc voltage proportional to the frequency of the generator up to a predetermined maximum frequency, not increasing above that maximum, and for amplifying the voltage produced. A comparator circuit compares the dc voltages.

Abstract: A testing device measures the impedance of secondary cells that form a battery, such as a lead acid battery, while the battery is in a float charge condition and connected to an active electrical load. The impedance measurement is made at a frequency selected to be different from those frequencies otherwise present in the charger-load circuit. A first application of the testing device monitors the battery for a change in impedance that can signal a developing defect in one or more individual cells or intercell connections that can prevent the battery from delivering its stored energy to the load. In a second application, the testing device is used to compare the impedance of individual cells and electrical connections to locate faulty components.

Abstract: A dual voltage power supply for a vehicle is disclosed with a DC generator, a single storage battery, a low voltage load circuit including the storage battery and a high voltage load circuit including load devices designed to be powered by voltages higher than the battery voltage. A high voltage regulator is responsive to the generator output voltage and controls the energization of the field winding of the generator for causing the generator to produce an output voltage meeting the requirements of the high voltage load circuit. A low voltage regulator receives the output voltage of the generator and produces a substantially constant regulated voltage for charging the battery and supplying the low voltage load circuit.

Abstract: In an embodiment for supplying power to sensitive telecommunications modules in an environment rich in radiated RF emissions, the AC power line is connected to a battery charger which is alternately connected to two rechargeable batteries. A third battery is connected in power transfer relation to the telecommunications modules and to a power control module, and in turn receives power from the one of the first and second batteries which is not being charged, such active battery being completely isolated from the AC power line. The third battery insures against transients and switching noise during switchover between the first and second batteries, and the power control module monitors the supply of power via an optoelectronic isolator and connects both the first and second batteries in parallel with the third battery in the event of a power failure.

Abstract: An automotive electrical system with a generator has outputs for loads requiring a high and low voltage, e.g., a heater and a battery. A field-controlled a.c. generator with three-phase output windings has a low voltage main terminal and an auxiliary terminal for high voltage loads. A step-down transformer and a first rectifier connect the windings and the main terminal while a second rectifieer directly connects the windings and the auxiliary terminal. A selector switch having a open and closed positions is connected between the main terminal and the auxiliary terminal. A voltage regulator for controlling current through the generator field is connected to the main terminal. When the selector switch is open the generator provides a dual voltage output i.e.

Abstract: Portable apparatus for charging a lead-acid battery from a direct current source such as a series of dry cells that can be conveniently carried in a motor vehicle or the like. An electronic circuit measures the actual current transferred to a battery undergoing charging and automatically signals when a preselected quantity of electric charge has been transferred to the battery undergoing charging. The electronic circuit means also signals that the battery undergoing charging has a preselected voltage level. The electronic circuit automatically signals that the direct current source has sufficient energy to charge a battery before a battery to be charged is connected thereto. The timing of the charge transfer is through the provision of charging and discharging a capacitor between preselected voltage levels by a current proportioned relative to the charging current and counting up a binary counter each time a preselected point in the oscillations are reached until a preselected count is reached.